chore: update index class type hint and docs

Author: Vanderhoof

docs/classes.md

@@ -158,7 +158,7 @@ Indexes are stored in the `indexes` attribute of a `Table` object.
 * **table** (`Table`) — link to table, for which this index is defined.
 * **name** (str) — index name, if defined.
 * **unique** (bool) — indicates whether the index is unique.
-* **type** (str) — index type, if defined. Can be either `hash` or `btree`.
+* **type** (str) — index type, if defined. Accepted values: `brin`, `btree`, `gin`, `gist`, `hash`, `spgist`.
 * **pk** (bool) — indicates whether this a primary key index.
 * **note** (note) — index note, if defined.
 * **comment** (str) — comment, if it was added just before index definition.

pydbml/_classes/index.py

@@ -22,7 +22,17 @@ def __init__(self,
                  subjects: List[Union[str, Column, Expression]],
                  name: Optional[str] = None,
                  unique: bool = False,
-                 type: Optional[Literal['hash', 'btree']] = None,
+                 type: Optional[
+                     Literal[
+                         # https://www.postgresql.org/docs/current/indexes-types.html
+                         "brin",
+                         "btree",
+                         "gin",
+                         "gist",
+                         "hash",
+                         "spgist",
+                     ]
+                 ] = None,
                  pk: bool = False,
                  note: Optional[Union[Note, str]] = None,
                  comment: Optional[str] = None):